FN Archimer Export Format
PT J
TI Effects of age and environment on survival of summer mortality by two selected groups of the Pacific oyster Crassostrea gigas
BT 
AF DEGREMONT, Lionel
   BOUDRY, Pierre
   ROPERT, Michel
   SAMAIN, Jean-Francois
   BEDIER, Edouard
   SOLETCHNIK, Patrick
AS 1:1;2:2;3:3;4:2;5:4;6:5;
FF 1:PDG-DOP-DCN-AGSAE-LGP;2:PDG-DOP-DCB-PFOM-PI;3:PDG-DOP-LER-LERN;4:PDG-DOP-DCB-PFOM-PI;5:PDG-DOP-LER-LERMPL;6:PDG-DOP-LER-LERPC;
C1 IFREMER, Lab Genet & Pathol, F-17390 La Tremblade, France.
   IFREMER, UMR Physiol & Ecophysiol Mollusques Marins M100, F-29280 Plouzane, France.
   IFREMER, Lab Environm Ressources Normandie, F-14520 Port En Bessin, France.
   IFREMER, Lab Conchylicole Bretagne, F-56470 La Trinite, France.
   IFREMER, Lab Environm Ressources Pertuis Charentais, F-17390 La Tremblade, France.
C2 IFREMER, FRANCE
   IFREMER, FRANCE
   IFREMER, FRANCE
   IFREMER, FRANCE
   IFREMER, FRANCE
SI LA TREMBLADE
   BREST
   LA TRINITE
SE PDG-DOP-DCN-AGSAE-LGP
   PDG-DOP-DCB-PFOM-PI
   PDG-DOP-LER-LERN
   PDG-DOP-LER-LERMPL
   PDG-DOP-LER-LERPC
IN WOS Ifremer jusqu'en 2018
IF 2.044
TC 32
UR https://archimer.ifremer.fr/doc/2009/publication-6972.pdf
LA English
DT Article
DE ;Summer mortality;Age;Environment;Genetic;Crassostrea gigas
AB This study investigated the effects of age (first or second summer of life) and environment (three study sites on French coasts) on summer mortality in Crassostrea gigas, using three generations of oysters produced during the Morest project. For each generation, two groups of oysters, selected either as 'resistant' (R) or 'susceptible' (S) to summer mortality at the age of 6 months in Rivière d'Auray (RA, South Brittany), were evaluated. In Ronce (Marennes-Oléron Bay) and RA, R oysters had low mortality during their first and second summers, while mortality was higher during the second summer in Baie des Veys (BDV, Normandy). In RA, S oysters exhibited higher mortality during their first summer than during their second, while the opposite result was found in BDV, indicating a significant environment by age interaction. Some oysters were also protected from mortality risk factors during their first year by keeping them in a nursery; they were then deployed at the two sites the following spring. Mortality in R oysters during their second year was lower than in S oysters in RA and BDV. Interestingly, mortality of the S oysters deployed in RA during their second year was much lower than the mortality observed in S oysters deployed during their first year, suggesting that S juveniles are more susceptible to summer mortality than S adults. As a consequence, the difference in mortality between the two selected groups in RA decreased from 40-45% to 5-9% when oysters were protected from summer mortality at the juvenile stage. In BDV, the difference in mortality between the two selected groups was similar whether oysters were deployed during their first or second year. The first reproductive event in oysters, combined with genetic differences between the groups interacting with local environmental conditions can go some way to explaining summer mortality events in our study. Cumulative mortality for each generation and site was higher in the S group than in the R group, indicating a positive response to selection in oysters up to 18 months old. Mortality was split into three categories: low background mortality, genetic effects from the selection and unknown mortality on which no investigation has yet concentrated. Finally, culture strategy on oyster farms is discussed with respect to oyster age and environment.
PY 2010
PD FEB
SO Aquaculture
SN 0044-8486
PU Elsevier Science Bv
VL 299
IS 1-4
UT 000275033500007
BP 44
EP 50
DI 10.1016/j.aquaculture.2009.12.009
ID 6972
ER

EF